I have been on meds for almost 30 years. I have changed antidepressants twice. You are the best judge of how well your current med is working. You can try to go off (with your doc's help) and try and see how you do, and go back on if needed. Or if you don't think it's working, you can ask doc for a change.

Add: I was on Zoloft for 20 years.